Like many visitors to the museum, I have used it. As you see, it is more of a spiral ramp, rather than stairs, so has a gentler slope.
It is a double helix, allowing separate up and down streams of pedestrians, built in 1932, inspired by a private staircase made for the pope in the 1500's.
No, it does not lead all the way to heaven
... but it gets you started.
Rod